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Ultrasonic wave nondestructive apparatus and method for measuring residual stress of welded structure

A technology for residual stress and welded structures, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, and can solve problems such as damage to workpieces, inability to meet residual stress measurements of welded structures, and time-consuming problems

Inactive Publication Date: 2008-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the traditional stress measurement method destroys the workpiece, takes time, and cannot meet the residual stress measurement of the welded structure in service state, and provides an ultrasonic non-destructive measurement device and method for the residual stress of the welded structure

Method used

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  • Ultrasonic wave nondestructive apparatus and method for measuring residual stress of welded structure
  • Ultrasonic wave nondestructive apparatus and method for measuring residual stress of welded structure
  • Ultrasonic wave nondestructive apparatus and method for measuring residual stress of welded structure

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specific Embodiment approach 1

[0050] Specific implementation mode one: the following combination figure 1 Describe this embodiment, this embodiment is made up of pulse signal source 1, probe group 2, signal receiving and processing device 3 and display 4, the output terminal of pulse signal source 1 is connected with the transmitting terminal 2-1 of probe group 2, and probe group 2 The receiving terminal 2-2 of the signal receiving and processing device 3 is connected to the input end, the output end of the signal receiving and processing device 3 is connected to the display 4, and the signal receiving and processing device 3 is embedded with a single chip microcomputer 3-1.

[0051] The display 4 displays the waveform received by the signal receiving and processing device 3 .

specific Embodiment approach 2

[0052] Specific implementation mode two: the following combination Figure 7 , Figure 8 , Figure 9 To illustrate this embodiment, the ultrasonic non-destructive measurement method implemented based on the device described in Embodiment 1 includes the following steps:

[0053] Step a: Determine the coordinates of the measuring point (x i ,y i ), read in or manually input the coordinates of the measuring point (x i ,y i ) and output to the signal receiving and processing device 3, wherein i is the subscript of the measuring point coordinates;

[0054] Step b: The transmitting terminal 2-1 of the probe group 2 injects the pulse signal emitted by the pulse signal source 1 into the workpiece 5 through the first propagation medium 2-3 at the first critical refraction angle, and then the critical refraction longitudinal wave generated is transmitted to the workpiece 5 in the spread;

[0055] Step c: Read the envelope data of the critical refraction longitudinal wave propagat...

specific Embodiment approach 3

[0094] Specific implementation mode three: the following combination figure 2 , Figure 6 Describe this embodiment, the difference between this embodiment and Embodiment 1 is that the probe set 2 is composed of a transmitting terminal 2-1, a receiving terminal 2-2 and a displacement sensor 2-5, and the transmitting terminal 2-1 includes a transmitting piezoelectric chip 2-1-1, the first propagation medium 2-3 and the transmission angle changing device 2-1-1', the receiving terminal 2-2 includes the first receiving piezoelectric wafer 2-2-1, and the second propagation medium 2-4 And the first receiving variable angle device 2-2-1 ', the transmitting variable angle device 2-1-1' and the first receiving variable angle device 2-2-1' control the transmitting piezoelectric wafer 2-1-1 and the first The angle α between the receiving piezoelectric chip 2-2-1 facing the opposite surface and the workpiece 5 maintains the first critical refraction angle, and the first propagation mediu...

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Abstract

The invention relates to a welding structure residual stress ultrasonic lossless measurement device and a method, in particular to a device and a method using ultrasonic for measuring the residual stress of a welding structure, belonging to the residual stress measurement field. The method aims at overcoming the problems of a traditional stress measurement method that work pieces are destroyed, time is consumed and the residual stress measurement can not be satisfied under the service condition of the welding structure. The two ends of a probe group of the invention are respectively connected with an impulse signal source and a signal receiving processing device which is connected with a display. And a microcontroller is embedded in the signal receiving processing device. In said method, the coordinate of a measured point is determined; the probe group emits impulse signals sent out from the impulse signal source into a work piece through a first critical refraction angle to generate critically refracted longitudinal waves, wherein, enveloping data are read by the signal receiving processing device and are discretized into digital signals and FIR filtering waves; total enveloping weight eigenvalue Mn is worked out; abnormal data are removed according to Brubbs criterion after one measured point is measured for a plurality of times, measuring position is changed for measuring again, and Mn and Mn+1 are worked out according to two measuring points to calculate the residual stress Delta of the work piece.

Description

technical field [0001] The invention relates to a device and method for measuring residual stress of a welded structure by ultrasonic waves, belonging to the field of residual stress measurement. Background technique [0002] The development of the national economy and military industry has promoted the rapid development of the welded structure industry, and the application range of welded structures is expanding. With the enlargement of welded structures, the specialization of materials, and the increasingly complex and harsh conditions of use of welded structures, people's service The demand for safety monitoring of welded structures in the state is becoming more and more urgent. For welded structures in service state, such as oil pipelines, spacecraft, and nuclear power plant equipment, the safety assessment and fatigue life prediction of welded structures in service state can be carried out by measuring the distribution of residual stress and welding defects in important...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 方洪渊刘雪松路浩张世平杨建国马子奇方坤赵翠华朱政
Owner HARBIN INST OF TECH
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